ADDISONIA COLORED ILLUSTRATIONS AND POPULAR DESCRIPTION OF PLANTS Volume 11 1926 LIBKARY New YORK ttO!ANiCAL PUBLISHED BY THE NEW YORK BOTANICAL GARDEN (ADDISON BROWN FUND) THB SCIENCE PEES3 PEINTINQ COMPANY LANCASTER, PA. CONTENTS Part 1 JUNB 30, 1926 PLATE PAG:B 353 Graptopetalum Bartramii 1 354 Thunbergia Gibsoni 3 355 Chelone glabra 5 356 Tecomaria capensis 7 357 Osmia borinquensis 9 358 I^apeyrousia cruenta 11 359 Allophyton mexicanum 13 360 Lycoris squamigera 15 Part 2 October 13, 1926 361 Erythronium americanum 17 362 Ginkgo biloba 19 /^ 363 L,espedeza Sieboldii 21 364 Cercidiphyllum japonicum ... 23 365 Nymphoides Humboldtianum 25 366 Catharanthus roseus 27 367 Primula kewensis 29 368 Gaillardia Amblyodon 31 Part 3 December 9, 1926 369 Deeringothamnus pulchellus 33 370 Azalea viscosa glauca 35 371 Teedia lucida 37 372 Turraea floribunda 39 373 Corylus pontica 41 374 Eryngium aquaticum 43 375 Pinus peuce 45 376 Ilex decidua 47 iii iv Addisonia Part 4 January 5. 1927 377 Torenia Fournieri 49 378 Desmothamnus lucidus 51 379 Tricyrtis hirta 53 380 Adenoropium Berlandieri 55 381 Helianthus tuberosus 57 382 Aubrietia deltoidea 59 383 Triphora trianthopliora 61 384 Ipomoea quinquefolia 63 Index 65 i.^:-^^-''^^:;''^-^m-l.;:s:t;^ ADDISONIA COLORED ILLUSTRATIONS AND POPULAR DESCRIPTIONS OF PLANTS Volume 11 Number 1 MARCH, 1926 PUBLISHED BY THE NEW YORK BOTANICAL GARDEN (ADDISON BROWN FUND) JUNE 30, 1926 ANNOUNCEMENT A bequest made to the New York Botanical Garden by its late President, Judpe Addison Brown, established the ADDISON BROWN FUND "the income and accumulations from which shall be applied to the founding and publication, as soon as practicable, and to the maintenance (aided by subscriptions therefor), of a high-class magazine bearing my name, devoted exclusively to the illustration by colored plates of the plants of the United States and its terri- torial possessions, and of other plants flowering in said Garden or its conservatories; with suitable descriptions in popular language, and any desirable notes and synonymy, and a brief statement of the known properties and uses of the plants illustrated." The preparation and publication of the work have been referred to Dr. John Hendley Barnhart, Bibliographer, and Mr. Kenneth Rowland Boynton, Head Gardener. Addisonia is published as a quarterly magazine, in March, June, September, and December. Each part consists of eight colored plates with accompanying letterpress. The subscription price is $10 annually, four parts constituting a volume. The parts will not be sold separately. Address: THE NEW YORK BOTANICAL GARDEN BRONX PARK NEW YORK CITY SiUfscribers are advised to bind each voluvie of ADDISONIA as in order to avoid losi tfie completed^ Possible or misplacement of parts; nearly the whole remainder of the edition of Volumes 1 to 10 has been made up into complete volumes, and but few separate parts can be supplied. ADDISONIA PLATE 353 J< r f K GRAPTOPETALUM BARTRAMII Addisonia 1 (Plate 353) GRAPTOPETALUM BARTRAMII Bartram's Stonecrop '^^^' YORK TanicaL Native of x4rizona 'jARDHN Family Crassulaceae Orpine Family Graptopetahcm Bartramii Rose, sp. nov. Many American species of Crassulaceae have been discovered in recent years. Among them are several which deserve to be grown as ornamentals. A study of the wealth of material now available has led to the recasting of the generic lines in this family and the establishing of a number of new genera. To one of these belongs the subject here illustrated. The genus Graptopetalum has already furnished two subjects for this journal (see plates 247 and 304) . In our account of the plant illustrated by pl,ate 304 we gave some information regarding the genus and told of the rediscovery of G. Rusbyi by Edwin B. Bartram in southeastern Arizona in 1920 and January, 1923, In February, 1923, Mr. Bartram collected in the same general region, although from a different mountain, a plant somewhat similar in size and ap- pearance. His herbarium specimen of this was first taken to be simply a form of G. Rusbyi. But Mr. Bartram felt quite certain that it was different, and when living specimens were afterward sent in it was observed that they were abundantly distinct. Not only are the leaves very different in shape and color, but also the inflorescence. In G. Rusbyi the flowers are arranged in secund racemes, while in G. Bartramii the inflorescence is an equilateral panicle. These specimens flowered in October, 1923, and again very abundantly in October, 1925, when our illustration was made. We take great pleasure in naming the new species for Mr. Bartram, who not only discovered it but first recognized that it was distinct from G. Rusbyi. Although Mr. Bartram is especially a moss student, he has collected also many interesting flowering plants. This plant grows at an altitude of 5000 feet on ledges in Flux Canyon, Patagonia Mountain, Santa Cruz County, Arizona. In cultivation the flowering stalks begin to grow early in June but develop very slowly, and the flowers do not open until the last of October and early November. The flowers with their banded petals 2 Addisonia are very attractive, but they have a strong disagreeable odor which resembles very much that of the stink-horn fungus, Bartram's stonecrop forms dense rosettes of twenty or more leaves, usually growing in cespitose clusters. The leaves are fiat or some- what concave above, more or less fleshy, bluish green with reddish margins and tip, an inch to two and one half inches long, ovate to broadly spatulate with acuminate tip, and glabrous. From several of the upper leaves two to seven flowering stems are produced, be- coming eight to twelve inches long and bearing fleshy bract-like leaves below and forming above a rather strict panicle or sometimes a simple raceme. The branches of the panicle are one- to three- flowered and are produced each from the axil of a bract; the pedicels are short. The sei)als are ovate, small, about one fifth of an inch long. The corolla-bud is acute and strongly 5-angled; the corolla is about half an inch long, at first with erect lobes but on the second day more or less spreading or nearlj- rotate and then an inch or more broad; after anthesis the lobes become erect again; its tube is a little shorter than the calyx; the lobes or petals are narrow, pointed, and beautiful!}- spotted or banded with red or brown, especially on the upper side. The ten stamens are attached to the top of the corolla-tube, short, erect the first day, but on the second reflexed behind the petals; the anthers are red; the five carpels are erect and tipped bj- a very short style. J. N. Rose. Explanation of Pl.\te. Fig. 1.—Basal rosette. Fig. 2.—Upper part of flowering stem. Fig. 3.—Flower, split open. Fig. 4.—Petal, with three stamens, X 2. Fig. 5. —Gynoecium, X 2. PLATE 354 ADDISONIA THUNBERGIA GIBSONI Addisonia (Plate 354) THUNBERGIA GIBSONI Gibson's Thunbergia Native of tropical East Africa Family Acanthaceae Acanthus Family Thunbergia Gibsojii S. Moore, Jour. Bot. 32: 131. 1894. Thimdergia is an interesting genus of the acanthus family, one which has not the strongly two-lipped flowers of most of the family. It is characterized by the two enlarged leaf-like bracts which form a hood over the calyx and the base of the corolla-tube. There are nearly one hundred species, of wide distribution in warm countries; more than fifty are natives of Africa. In horticulture we know one shrub and some half dozen elegant vines. The shrub is Thunbergia {Meyenia) erecta, a tropical African bush with blue and yellow flowers, grown for ornament in West Indian and other tropical gardens. A choice vine for these gardens or our greenhouses is Thunbergia grandiffora, with large bell-like flowers of yellow and blue on long stalks. Two herbaceous vines of the genus are of that kind which help to make the very roadsides of the settled tropics gardens in themselves. These vines are T. fragratis, the white thunbergia, brought from old world tropics and naturalized along the roadsides in the West Indies and elsewhere; and more common still, the T. alata or black-eyed Susan, which adorns the fencerows there. This last African vine has several color forms varying from rich chrome yellow to white, retaining a prominent purple eye in the center of the flowers. Gibson's thunbergia is but lately introduced into our gardens. It will fl.ower in one season from seed if started early and makes an important addition to our list of annual vines. The seeds germinate readily in a greenhouse or hotbed and perhaps might be tried in warm garden soil out doors. The cotyledons are nearly round, but the first true leaves show the winged petiole and triangular leaf-blade. Our illustration was made from plants flowering in a sunny border during the summer of last year. These were grown from seeds listed by local seedsmen. Thunbergia Gibsoni is an herbaceous vine, with hairy, reclined stems bearing two leaves and a flower at each node. The leaves are opposite, soft-hairy and about one inch broad with winged petioles about one inch long. The leaf-blades are broadly hastate, as long as 4 Addisoxia the petioles, with bases nearly cordate and acute to rounded apices. The flowers are on slender hairy pedicels three to five inches long. The base of the flower is hooded by a bonnet-like spathe, formed by two joined leafy bracts, which are soft-hairy, brownish in color, and three-ribbed. The corolla-tube is one inch long, constricted, orange outside, inside yellow with orange stripes. The limb of the corolla is about one inch across, with five obovate regular orange-colored lobes.